Are my bcrypt results still realistic?

Hello everyone. I need some bcrypt speed results as a reference. So I ran oclHashcat in bcrypt mode.

But I had to set the following parameters: -n 2 -u 4
Any parameter above that gave me "ERROR: cuStreamSynchronize() 700".

Now I want to know if my results are still reasonable for being used as a reference against another hash function implemented on the same GPU: I want to say: look, hash function xyz has this speed, while bcrypt has that speed although the CPU runtimes are the same.
Can I do that or should I assume that bcrypt could normaly be attacked more efficient?


P.S.: GeForce GTX480